At our local Japanese supermarket - Mitsuwa - located off of Saratoga exit off of 280 in San Jose, you can buy great quality, sashimi-grade raw fish and have your own sushi feast at home. We buy probably 10 different kinds (total about $50-60), and it's enough to stuff four people until they can't eat anymore, at about a quarter of what it would cost at a restaurant. And it's so much more fun to DIY! No fancy rolls, just sashimi, nigiri, and handrolls. Get a pack of dry nori (seaweed sheets), some shiso leaves, sprouts, cucumber, and avocado. Steam rice, add rice vinegar. Slice the fish. And sculpt your own sushi masterpieces to your heart's and stomach's content. Yum!
Always perfect with Kabinett (slightly off-dry) level of German Riesling, as the elements in the wine complement the umami elements in the fish, soy sauce and wasabi. I also like an entry level red Burgundy, the lighter the better, such as from the light 2007 vintage, with good acidity. It goes really well with heartier fish such as tuna and unagi.